we need to protect their environment. we have a strict quarantine system to protect the integrity of the environment. forty years on, it's still a class-a nature reserve. it's our job to look after them. ...it's my job to look after it. ♪ ♪ >> pelley: since the killings at sandy hook elementary school there has been a lot of talk about getting guns out of the hands of people not entitled to have them. well, california is trying, but john blackstone has found it's a lot easier said than done. >> reporter: we rode along with special agent john marsh of the state's department of justice as his team prepared to confiscate guns from a man in stockton, california. >> he's a felon, and he has two handguns still registered to him. >> reporter: it's tense work. the people the agents are looking for are convicted felons or mentally unstable, and they have guns. the state has a list of about 20,000 such people with 40,000 guns, but because of budget restrictions there are only 33 agents to find them. you've got a backlog. >> a h